Reciprocating tool



June 21, 1949. L. M. LARSEN RECIPROCATING TOOL 2 Sheets-Sheet 1 Filed March 9, 1945 I )1 uentor 250 A034 715672,

9 By @/QGW M a a Attorzeys June 21, 1949. M. LARSEN RECIPROCATING' TOOL 2 Sheets-Sheet 2 Filed March 9, '1945 Inventor Patented June 21, 1949 UNITED STATES PATENT OFFICE RECIPROCATING TOOL Leo M. Larsen, Spokane, Wash.

Application March 9, 1945, Serial No. 581,776

1 Claim. 1

The present invention relates to new and useful improvements in tools having a reciprocating motion and has for its primary object to provide a novel construction for converting the rotary motion of the motor into reciprocating motion for operating tools for various purposes where a reciprocation of the tool is desired.

A further object is to provide a device of this character of simple and practical construction, which is efiicient and reliable in use, relatively inexpensive to manufacture and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view.

Figure 2 is a bottom plan view.

Figure 3 is a transverse sectional view through the cam housing taken substantially on a line 3--3 of Figure 1,

Figure 4 is a longitudinal sectional view through the cam housing attached to the end of the motor.

Figure 5 is a side elevational view of the cam, and

Figure 6 is a perspective view of the yoke providing the driving connection between the cam and the tool.

Referring now to the drawings in detail, wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention, the numeral 5 designates an electric motor of conventional construction having a hand-grip 6 at one side thereof provided with a switch I for controlling the electric current provided for energizing and deenergizing the motor.

The motor includes a shaft 8 projecting from one end thereof into a housing 9 secured to the end of the motor by bolts 10.

Secured to the shaft 8 is a collar ll having a cam groove l2 extending circumferentially thereof and in which is received the inturned ends [3 formed on a U-shaped yoke l4.

The yoke I4 is formed on one end of a rod l5 slidably mounted in bearing l6 positioned in the reduced outer end ll of the housing 9.

The stem I5 is formed with a square portion [8 immediately adjacent the yoke l4 which is slidably mounted in a U-shaped bearing l9 secured to the reduced end of the housing by screws 20. The enlarged square portion l8 of the stem forms a shoulder 2! against which one end of a coil spring 22 abuts, the other end of the spring bearing against the bearing Hi. The spring serves as a bumper to reduce shock during the rapid reciprocation of the yoke M. A tool chuck 23 is threaded on the outer end of the stem IS, the chuck being of conventional construction and in which various types of tools 24 may be interchangeably mounted.

In the operation of the device it will be apparent that the shaft 8 of the motor will cause a rotation of the collar I I having the cam groove l2 therein and by reason of the engagement of the inturned end l3 of the yoke M in said groove the yoke and stem IE will have a reciprocating motion imparted thereto which is transmitted to the chuck 23 and tool 24. The bearing 19 engaging the squared portion 18 of the stem will prevent rotation of the yoke and stem as well as the tool 24.

It is believed that the details of construction and manner of use of the device will be readily understood from the foregoing without further detailed explanation.

Having thus described the invention, what I claim is:

An attachment for an electric motor and comprising a housing secured to one end of the motor and enclosing an adjacent end of the shaft of the motor, a collar secured to the shaft and having a cam groove extending circumferentially thereof, a yoke positioned in the housing and having inturned ends engaged in said groove, a stem projecting from the yoke and slidably mounted in the outer end of the housing, said stem having a. squared portion, a U-shaped bearing carried by the housing slidably receiving said squared portion of the stem to prevent rotation thereof, said squared portion of the stem forming a shoulder thereon, a coil spring carried by the housing and engaged by said shoulder to provide a shock absorber for the stem and a tool chuck attached to the outer end of the stem.

LEO M. LARSE'N.

REFERENCES CITED The following referenlces are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 741,519 Mahafiy Oct. 13, 1903 764,470 Jones July 5, 1904 1,048,684 Gooch Dec, 31, 1912 1,134,047 Hunter Mar. 30, 1915 1,723,100 Voorhees Aug. 6, 1929 1,801,017 Major Apr. 14, 1931 

